Elevator safety system.



G. S. WILUAMSON.

ELEVATOR SAFETY SYSTEM.

APPLICATION FILED MAR. 24, I9l6.

121 3,4:42. Patented Jim. 23, 191?.

2 SHEETS-SHEET 2.

which passes upward through the floor of the car and is pivoted at its upper end to an arm 25 on a tiltable bar 26 having a notch 27 for locking the controller lever 28 in midposition. When the operator brings his car to a stop at a landing and depresses the pedal 17, the shoe 10 is projected to open the landing door lock. The same operation locks the car controller, which remains looked as long as the door is unlocked, because of the engagement of the detent 13 behind the shoe 10.

In accordance with the preferred embodiment of the present invention the car is also provided with another connection for operating the shoe, the same being preferably in the form of a two-armed lever 29 fulcrumed on a pivot 30 in a generally upright position outside one of the side walls of the car, so that it may be disposed opposite the portions 3 of the shaft. The lower end of this lever passes below the floor of the car and is connected by a link 31 with a crank arm 32 projecting upward from the rockshaft 19. As indicated at 33 the connection between this link and arm may be slotted, so that operation of the lever moves the rock-shaft, while movement of the rockshaft does not affect the lever. The upper end of the lever bears a second shoe 34-, which is adapted to receive the thrust of a push key 35, which may be inserted through an opening 36 provided in the shaft portion 3 at one or more of the landings, but usually at the bottom landing. The relation between the two shoes is such that the shoe 34: is in position to be actuated by the key when the shoe 10 is opposite the contact portion 11 of the lock. It will be apparent that rearward pressure on the key rocks the lever 29 in such manner as to project the shoe 34, thereby releasing the lock of the shaft door. The operation of the mechanism on the car by means of the key also looks the controller, so that after the door has been opened and the person has entered the car it is impossible for him to operate the controller so as to cause the car to leave the landing without first closing the door.

The key and key hole may be of such formation as to render impossible or extremely unlikely any unauthorized or mischievous unlocking of the landing door. In the illustration given the opening 36 is provided with a plate 37 formed With a curved slotted aperture 38, which accommodates a key of corresponding formation, the slot being too narrow to permit the passageof an ordinary rod.

What is claimed as new is:

1. In a safety system for elevators having a shaft with a plurality of landings, the combination with a landing door, and a shaft lock for the same, of a car having a controller, mechanism on the car operable to open said lock and to render the con troller inoperative, and means comprising an inscrtiblc and removable key for opening said look from the outside of the landing door.

2. In a safety system for elevators having a shaft with a plurality of landings, the combination of a landing door, a mechanical lock therefor, a car having a controller and mechanism on the car for opening the lock and rendering the controller inoperative, a shaft wall portion adjacent said door provided with a key hole, a key insertible in said hole, and means whereby said key may be operated to open said lock in the presence of the car.

3. In a safety system for elevators having a shaft with a plurality of landings, the combination with a landing door, a shaft lock for said door, a car having a controller, a car shoe for opening said lock, and mechanism on the car operable to project said shoe and at the same time render the controller inoperative, a shaft wall portion adjacent said door provided with a key hole, and a key insertible in said hole to operate the mechanism on the car.

4. In a safety system for elevators having a shaft with a plurality of landings, the combination of a shaft lock for a landing door, a car having a controller, mechanism on the car operable to open said lock and at the same time to prevent starting of the car by locking the controller, and means requiring the presence of the car for opening said look from the outside of the door.

5. In an elevator, the combination of a door at a landing, a mechanical lock for said door, a pedal and train of mechanism on the car for releasing said lock, and means whereby said lock releasing mechanism on the car may be actuated from the landing at the outer side of the door to release the lock.

6. In an elevator, the combination of a landing door, a lock for said door, a car having a controller, mechanism on the car including a lock for the controller and a member for releasing the landing door look, a device enabling the car operator to actuate said mechanism, and means for actuating said mechanism from the landing at the outer side of the door.

7. In an elevator, the combination of a landing door and a lock for said door, an operators device on the car and mechanism on the ear operable by said device to release said lock, a key for operating said mechanism from the landing at the outer side of the door, and means on the car to constitute a connection between said key and said car mechanism.

8. In an elevator, the combination of a landing door lock, a car shoe for releasing said look, a pedal and train of mechanism on the car for operating said shoe to release said lock and means whereby said shoe may be operated from the landing at the outer side of the door.

9. In an elevator, the combination with a landing door, and a lock for the same, of an unlocking member operable by a person outside the door, an operating train on the car including shoes for engagement respectively with the unlocking member and with the lock, and a pedal for operating said train from the car.

10. In an elevator, the combination of a landing door lock, and an unlocking member operable by a person outside the door, in combination with operating connections carried by the car to be interposed between said member and the lock when the car is at the landing, and pedal-operated means for operating said connections from the car and simultaneously locking the car controller. Y

11. In an elevator, a landing door and a lock for the same, in combination with a car, mechanism at the bottom of the car for releasing said lock, pedal-operated means on the car for operating said mechanism and simultaneously locking the car controller, and means extending upwardly on the car from said mechanism to enable the same to be operated from the landing at the outer side of the door.

12. In an elevator, a landing door lock, means whereby the car operator may release said lock, the same comprising a shoe at the bottom of the car, and a lever connected with said shoe and extending upwardly on the car, whereby the shoe may be operated from the landing outside of th door.

13. In an elevator, a landing door lock, mechanism on the car comprising a pedaloperated, rock-shaft and a shoe connected with said rock-shaft to release the lock, an upwardly extending lever connected with said rock-shaft, and a key adapted to operate through the wall of the shaft to rock said lever and thereby release the lock.

14. In an elevator, the combination with an elevator shaft and a plurality of landings, each having a landing door and a lock for such door, or" a car having a controller ing, and a connection on the car positioned to come opposite the corresponding aperture to enable said means to be operated by a key inserted in said aperture.

16. In an elevator, the combination of a landing having a door and a lock for the door, a car and mechanism on the car whereby the car operator may open said lock and simultaneously prevent starting of the car, and a key insertible at the landing to 0perate said mechanism from the outer side of the door.

17. In an elevator, a landing door, a lock for the same, and a wall adjacent said door, combined with mechanism on the car operable to open said lock, and a key insertible in said wall to open said lock through the mechanism on the car.

18. In an elevator, a landing having a door and a lock for-the same, mechanism on the car to open said lock and prevent starting of the car, and a key insertible at the landing to operate said mechanism on the car.

19. In an elevator, the combination of a landing door, a lock for the same, an unlocking device operable at the outer side of the landing door, mechanism on the car operable by said device to open said lock and prevent starting of the car, and an automatic detent for holding the car mechanism in actuated condition until released by the closing of the door.

In testimony whereof, I have signed my name to this specification, in the presence of 106 two subscribing witnesses.

GLENN S. WILLIAMSON.

Witnesses:

FRANK S. HARTNETT, EDITH M. CLARK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

